<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>示例</title>
</head>
<body>

    <div id="app">

        <input type="text" v-model="name" placeholder="你的名字" />
        <h1>你好, {{ name }}</h1>

    </div>

    <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
    <script>

        var app = new Vue({
            el: "#app",
            data: {
                name: ''
            }
        });

        console.log(name);
    </script>

</body>
</html>